Develop Reference

I am new in android,i want to delete a row on clicking delete button that are shown in front of each row in list view

This is may XML class random values in which we make a row that I want to delete
randomvalues.xml
<LinearLayout
android:id="#+id/linear"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_below="#+id/addbtn">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="#+id/img"
android:layout_width="30dp"
android:layout_height="40dp"
android:src="#drawable/img1"
/>
<LinearLayout
android:layout_width="255dp"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#339966"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/adress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Address"
android:textColor="#606060" />
</LinearLayout>
</LinearLayout>
<ImageButton
android:id="#+id/removebtn"
android:layout_width="30dp"
android:layout_height="40dp"
android:src="#drawable/remove"/>
</LinearLayout>
</LinearLayout>
this is my activity_main XML in which i used a list view to show a row that I make in random values XML file
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.chaqeel.taskviews.MainActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/linear">
<ImageButton
android:id="#+id/addbtn"
android:layout_width="30dp"
android:layout_height="40dp"
android:src="#drawable/add"
android:layout_marginLeft="280dp"/>
</LinearLayout>
<ListView
android:id="#+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/linear"
>
</ListView>
</RelativeLayout>
This is MainActivity.java in which we used a array to show the values
MainActivity.java
package com.example.chaqeel.taskviews;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Collections;
public class MainActivity extends Activity {
ListView lv;
String[] Names = {"Aqeel", "Ali", "Ansar", "Usama", "Farhad"};
String[] Address = {"Chakwal", "Rawalpindi", "Islamabad", "Lahore",
"Multan"};
int[] Images = {R.drawable.img1, R.drawable.img2, R.drawable.img3,
R.drawable.img4, R.drawable.img5};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listview);
lv.setAdapter(new dataListAdapter(Names, Address, Images));
}
class dataListAdapter extends BaseAdapter {
String[] Name, Addres;
int[] imge;
/*dataListAdapter() {
Name = null;
Addres = null;
imge=null;
}*/
public dataListAdapter(String[] text, String[] text1, int[] text3) {
Name = text;
Addres = text1;
imge = text3;
}
public int getCount() {
return Name.length;
}
public Object getItem(int arg0) {
return null;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup
parent) {
LayoutInflater inflater = getLayoutInflater();
final View row;
row = inflater.inflate(R.layout.randomvalues, parent, false);
final TextView Name, Addres;
ImageView imge;
Name = (TextView) row.findViewById(R.id.name);
Addres = (TextView) row.findViewById(R.id.adress);
imge = (ImageView) row.findViewById(R.id.img);
Name.setText(Names[position]);
Addres.setText(Address[position]);
imge.setImageResource(Images[position]);
final ArrayList<String> lvv= new ArrayList<>();
Collections.addAll(lvv,Names);
// Collection.addAll(lvv,Address);
ImageButton dltbutton = (ImageButton) findViewById(R.id.removebtn);
dltbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
lvv.remove(Names);
lvv.remove(Address);
notifyDataSetChanged();
}
});
return (row);
}
}
}

In the onClickListener try the following code
youradapter.notifyDataSetChanged();

In the deletebutton onClickListener try this
Names = ArrayUtils.removeElement(Names,Names[position]);
Address = ArrayUtils.removeElement(Address,Address[position]);
notifyDataSetChanged();
Though it is advised to use OOP concept like a class to hold the Arrays of Names,Address and Images.

Try below code:
dltbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Name = ArrayUtils.removeElement(Names, Names[position]);
Address = ArrayUtils.removeElement(Address, Address[position]);
imge = ArrayUtils.removeElement(imge, imge[position]);
notifyDataSetChanged();
}
});

change this:
ImageButton dltbutton = (ImageButton) findViewById(R.id.removebtn);
dltbutton.setTag(position);
dltbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Integer index = (Integer) view.getTag();
lvv.remove(index.intValue());
notifyDataSetChanged();
}
});

Are you from Chakwal? I am Chakwalian. Again StackOverflow is telling me that my answer does not meet thier quality requirements.

You need to better idea to use Model class as below:-
create a model class MyModel.class
import java.util.ArrayList;
import java.util.List;
public class MyModel {
String Name, Address;
int image;
public MyModel(String name, String address, int image) {
Name = name;
Address = address;
this.image = image;
}
public String getName() {
return Name;
}
public String getAddress() {
return Address;
}
public int getImage() {
return image;
}
}
and then add with adapter class see below:
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity {
ListView lv;
String[] Names = {"Aqeel", "Ali", "Ansar", "Usama", "Farhad"};
String[] Address = {"Chakwal", "Rawalpindi", "Islamabad", "Lahore",
"Multan"};
int[] Images = {R.drawable.ic_menu_camera, R.drawable.ic_menu_gallery, R.drawable.ic_menu_manage,
R.drawable.ic_menu_send, R.drawable.ic_menu_share};
private List<MyModel> myModel=new ArrayList<>();
private DataListAdapter dataListAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.act_main);
lv = (ListView) findViewById(R.id.listview);
for(int i=0;i<Names.length;i++){
myModel.add( new MyModel(Names[i],Address[i],Images[i]));
}
dataListAdapter=new DataListAdapter(myModel);
lv.setAdapter(dataListAdapter);
}
class DataListAdapter extends BaseAdapter {
private List<MyModel> myModel=new ArrayList<>();
public DataListAdapter(List<MyModel> myModel) {
this.myModel=myModel;
}
public int getCount() {
return myModel.size();
}
public Object getItem(int arg0) {
return null;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, final ViewGroup
parent) {
LayoutInflater inflater = getLayoutInflater();
final View row;
row = inflater.inflate(R.layout.randomevalue, parent, false);
final TextView Name, Addres;
ImageView imge;
Name = (TextView) row.findViewById(R.id.name);
Addres = (TextView) row.findViewById(R.id.adress);
imge = (ImageView) row.findViewById(R.id.img);
Name.setText(myModel.get(position).getName());
Addres.setText(myModel.get(position).getAddress());
imge.setImageResource(myModel.get(position).getImage());
ImageButton dltbutton = (ImageButton) row.findViewById(R.id.removebtn);
dltbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
myModel.remove(position);
notifyDataSetChanged();
}
});
return (row);
}
}
public void addMore(View v)
{
myModel.add( new MyModel("Mahesh","India",R.drawable.ic_menu_share));
dataListAdapter.notifyDataSetChanged();
}
}
public void addMore(View v)
{
myModel.add( new MyModel("Mahesh","India",R.drawable.ic_menu_share));
dataListAdapter.notifyDataSetChanged();
}
add android:onClick="addMore" to your add button
it will fine Happy Coding :)

#Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
AdapterContextMenuInfo info =(AdapterContextMenuInfo) item.getMenuInfo();
pos=info.position;
deleteditem=myList.get(pos);
if(item.getTitle()=="Delete")
{
String delete = myList.get(pos);
File f = new File(path + "/"+ delete);
if (f != null && f.exists())
{
f.delete();
}
myList.remove(pos);
adapter. notifyDataSetChanged();
Toast.makeText(getApplicationContext(), "item has deleted",Toast.LENGTH_LONG).show();
}

there are no any display on listView with baseadapter

every one,
I am a beginning learner on android system ,
I create a small app that could get specific data , like foreign exchange rate from bank website ,
this app uses Jsoup , ListView , BaseAdapter etc...
finally , the only problem is the listView has no any display ,
could any one tell me , how to fix it.
Thanks.
Category.java
public class Category
{
String bank_name;
String page_url;
Category(String bank_name,String url)
{
this.bank_name=bank_name;
this.page_url=url;
}
#Override
public String toString()
{
return bank_name;
}
}
MainActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.content.*;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends Activity
{
ArrayList<Category> items;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
items=new ArrayList<Category>();
items.add(new Category("台灣銀行","http://rate.bot.com.tw/Pages/Static/UIP003.zh-TW.htm"));
ArrayAdapter<Category> adapter = new ArrayAdapter<Category>(this , android.R.layout.simple_list_item_1 ,items);
ListView lv = (ListView)findViewById(R.id.lv);
lv.setAdapter(adapter);
lv.setOnItemClickListener(itemClick);
}
OnItemClickListener itemClick = new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> av , View v , int position , long id)
{
Category category = items.get(position);
Intent intent = new Intent();
intent.setClass(MainActivity.this , RateActivity.class );
intent.putExtra("bank_name", category.bank_name);
intent.putExtra("page_url" , category.page_url);
startActivity(intent);
}
};
RateBean.java
public class RateBean
{
private String currency;
private String cashBuy;
private String cashSold;
private String spotBuy;
private String spotSold;
public RateBean()
{
currency = "";
cashBuy = "";
cashSold = "";
spotBuy = "";
spotSold = "";
}
public RateBean(String [] strArr)
{
this.currency=strArr[0];
this.cashBuy=strArr[1];
this.cashSold=strArr[2];
this.spotBuy=strArr[3];
this.spotSold=strArr[4];
}
public RateBean(String currency , String cashBuy , String cashSold , String spotBuy ,String spotSold)
{
setCurrency(currency);
setCashBuy(cashBuy);
setCashSold(cashSold);
setSpotBuy(spotBuy);
setSpotSold(spotSold);
}
//Currency setter and getter
public void setCurrency(String currency)
{
this.currency = currency ;
}
public String getCurrency()
{
return currency;
}
//Cash buy setter and getter
public void setCashBuy(String cashBuy)
{
this.cashBuy = cashBuy;
}
public String getCashBuy()
{
return cashBuy;
}
//Cash sold setter and getter
public void setCashSold(String cashSold)
{
this.cashSold = cashSold;
}
public String getCashSold()
{
return cashSold;
}
//Spot buy setter and getter
public void setSpotBuy(String spotBuy)
{
this.spotBuy = spotBuy;
}
public String getSpotBuy()
{
return spotBuy;
}
//Spot sold setter and getter
public void setSpotSold(String spotSold)
{
this.spotSold = spotSold;
}
public String getSpotSold()
{
return spotSold;
}
}
RateActivity.java
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.util.ArrayList;
public class RateActivity extends ListActivity
{
Context context ;
ArrayList<RateBean> rateBean_item;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rate_show);
TextView updateTime = (TextView)findViewById(R.id.updateTime_textView);
Intent intent = getIntent();
String category = intent.getStringExtra("bank_name");
String page_url = intent.getStringExtra("page_url");
setTitle(category);
context=this;
ConnectThread thread = new ConnectThread(context , rateBean_item , page_url , updateTime);
thread.start();
}
public class ConnectThread extends Thread
{
Context context;
ArrayList<RateBean> rateBean_item;
String page_url ;
TextView updateTime;
RateAdapter adapter;
RateBean rateBean;
int i =0;
public ConnectThread(Context context , ArrayList<RateBean> rateBean_item , String page_url , TextView updateTime )
{
this.context=context;
this.rateBean_item=rateBean_item;
this.page_url=page_url;
this.updateTime=updateTime;
}
#Override
public void run()
{
try
{
String currency="";
String cashBuy="";
String cashSold="";
String spotBuy="";
String spotSold="";
Document doc = Jsoup.connect(page_url).get();
rateBean_item = new ArrayList<>();
String temp=doc.select("td[style=width:326px;text-align:left;vertical-align:top;color:#0000FF;font-size:11pt;font-weight:bold;]").text();
String time=temp.substring(12);
updateTime.setText("匯率更新時間：\n" + time);
for( Element title:doc.select("td.titleLeft"))
{
currency=title.text();
if( i < doc.select("td.decimal").size())
{
cashBuy=doc.select("td.decimal").eq(i++).text();
cashSold=doc.select("td.decimal").eq(i++).text();
spotBuy=doc.select("td.decimal").eq(i++).text();
spotSold=doc.select("td.decimal").eq(i++).text();
rateBean = new RateBean( a , b , c ,d , e );
rateBean_item.add(rateBean);
}
}
adapter = new RateAdapter(context , rateBean_item);
setListAdapter(adapter);
adapter.notifyDataSetChanged();
}
catch( Exception exception )
{
exception.printStackTrace();
}
}
}
}
RateAdapter.java
import java.util.ArrayList;
import android.util.Log;
import android.widget.BaseAdapter;
import android.view.*;
import android.widget.*;
import android.content.*;
public class RateAdapter extends BaseAdapter
{
private LayoutInflater inflater;
private ArrayList<RateBean> list ;
public RateAdapter()
{
}
public RateAdapter(Context context , ArrayList<RateBean> list )
{
this.inflater = LayoutInflater.from(context);
this.list = list;
}
#Override
public int getCount()
{
return list.size();
}
#Override
public Object getItem(int position)
{
return list.get(position);
}
#Override
public long getItemId(int position)
{
return position;
}
public static class ViewHolder
{
TextView currency_name;
TextView cash_buy;
TextView cash_sold;
TextView spot_buy;
TextView spot_sold;
}
#Override
public View getView( int position , View convertView , ViewGroup parent)
{
ViewHolder holder;
if(convertView == null)
{
convertView = inflater.inflate(R.layout.rate_item , null);
holder = new ViewHolder();
holder.currency_name = (TextView)convertView.findViewById(R.id.xml_currency);
holder.cash_buy = (TextView)convertView.findViewById(R.id.xml_cashBuy);
holder.cash_sold = (TextView)convertView.findViewById(R.id.xml_cashSold);
holder.spot_buy = (TextView)convertView.findViewById(R.id.xml_spotBuy);
holder.spot_sold = (TextView)convertView.findViewById(R.id.xml_spotSold);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder)convertView.getTag();
}
RateBean rateItem = list.get(position);
holder.currency_name.setText(rateItem.getCurrency());
holder.cash_buy.setText(rateItem.getCashBuy());
holder.cash_sold.setText(rateItem.getCashSold());
holder.spot_buy.setText(rateItem.getSpotBuy());
holder.spot_sold.setText(rateItem.getSpotSold());
return convertView;
}
}
activity_main.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/title_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="銀行查詢選擇"/>
<ListView
android:id="#+id/lv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
activity_rate_show.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/updateTime_textView"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium"
android:hint="updateTime"/>
<Button
android:id="#+id/fresh_button"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:onClick="onClick"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/button_fresh"/>
</LinearLayout>>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1.5"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/currency"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/cash_buy"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/cash_sold"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/spot_buy"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/spot_sold"/>
</LinearLayout>
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
rate_item.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/xml_currency"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1.25"
android:textAppearance="?android:attr/textAppearanceLarge"
android:hint="text"/>
<TextView
android:id="#+id/xml_cashBuy"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium"
android:hint="text"/>
<TextView
android:id="#+id/xml_cashSold"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium"
android:hint="text"/>
<TextView
android:id="#+id/xml_spotBuy"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium"
android:hint="text"/>
<TextView
android:id="#+id/xml_spotSold"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceMedium"
android:hint="text"/>
</LinearLayout>

<ListView
android:id="#+id/lv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
Your listview needs a height, it cannot be wrap_content. Give it a height like 500dp or match_parent.

cant get profile image and button image in custom listview

i am a beginner in android programming and i made a custom list view which should present the user details by searching function. while i search the the user i get only the name and the mobile of the user but the default images is not presenting.
this is what i get:
and this is what i would like to get:
this is the layout for the each row in the list:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ffffffff"
>
<ImageView
android:id="#+id/profileImage"
android:layout_width="80dp"
android:layout_height="80dp"
android:src="#drawable/camera"
android:background="#drawable/border"
android:paddingLeft="10dp"
android:paddingRight="10dp" />
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:textColor="#000000"
android:textSize="16dp"
android:text="Full name"
android:layout_marginTop="5dp"
android:layout_marginLeft="10dp"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/profileImage"
android:layout_toEndOf="#+id/profileImage" />
<TextView
android:id="#+id/desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:textColor="#000000"
android:textSize="14dp"
android:text="User details"
android:layout_toRightOf="#+id/profileImage"
android:layout_alignBottom="#+id/profileImage"
android:layout_toLeftOf="#+id/imageButtonInviteUser"
android:layout_toStartOf="#+id/imageButtonInviteUser"
android:layout_below="#+id/title" />
<ImageButton
android:layout_width="80dp"
android:layout_height="80dp"
android:src="#drawable/add_user_50"
android:id="#+id/imageButtonInviteUser"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:background="#drawable/border"/>
<View
android:id="#+id/divider2"
android:layout_below="#+id/profileImage"
android:layout_width="fill_parent"
android:layout_marginTop="1dp"
android:layout_height="6dp"
android:background="#android:color/darker_gray"/>
</RelativeLayout>
</RelativeLayout>
main layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editTextSearch"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Search..." />
<View
android:id="#+id/divider1"
android:layout_below="#+id/editTextSearch"
android:layout_width="fill_parent"
android:layout_height="6dp"
android:background="#android:color/darker_gray"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/divider1"
android:id="#+id/scrollViewListView"
android:fillViewport="true"
android:layout_above="#+id/linearLayoutBtn">
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/listViewusers"
android:layout_below="#+id/divider1"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</ScrollView>
<View
android:id="#+id/divider2"
android:layout_below="#+id/scrollViewListView"
android:layout_width="fill_parent"
android:layout_height="6dp"
android:background="#android:color/darker_gray"/>
<LinearLayout
android:id="#+id/linearLayoutBtn"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<Button android:text="Save"
android:id="#+id/ButtonSave"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
</Button>
<Button android:text="Discard"
android:id="#+id/ButtonDiscard"
android:layout_toRightOf="#+id/ButtonSave"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1">
</Button>
</LinearLayout>
</RelativeLayout>
custom adapter:
/**
* Created by matant on 9/24/2015.
*/
import java.util.List;
import com.example.matant.gpsportclient.R;
import com.example.matant.gpsportclient.Utilities.InviteUsersListRow;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
public class InviteUsersArrayAdapter extends ArrayAdapter<InviteUsersListRow> {
Context context;
List<InviteUsersListRow> rowUsers;
public InviteUsersArrayAdapter(Context context,int resourceId, List<InviteUsersListRow> items) {
super(context, resourceId, items);
this.context = context;
this.rowUsers = items;
}
/*private view holder class*/
private class ViewHolder {
ImageView imageView;
TextView txtTitle;
TextView txtDesc;
ImageButton imgStatus;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
InviteUsersListRow rowItem = (InviteUsersListRow) getItem(position);
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.invite_users_listview_row, null);
holder = new ViewHolder();
holder.txtDesc = (TextView) convertView.findViewById(R.id.desc);
holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
holder.imageView = (ImageView) convertView.findViewById(R.id.profileImage);
holder.imgStatus = (ImageButton) convertView.findViewById(R.id.imageButtonInviteUser);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txtDesc.setText(rowItem.getDesc());
holder.txtTitle.setText(rowItem.getTitle());
holder.imageView.setImageResource(rowItem.getImageId());
holder.imgStatus.setImageResource(rowItem.getImageStatus());
return convertView;
}
#Override
public int getCount() {
return rowUsers.size();
}
#Override
public InviteUsersListRow getItem(int position) {
return rowUsers.get(position);
}
#Override
public long getItemId(int position) {
return rowUsers.indexOf(getItem(position));
}
}
row in list:
package com.example.matant.gpsportclient.Utilities;
/**
* Created by matant on 9/22/2015.
*/
public class InviteUsersListRow {
private int imageId,imagestatus;
private String title;
private String desc;
public InviteUsersListRow(int imageId,int status, String title,String desc){
this.imageId = imageId;
this.title = title;
this.desc = desc;
this.imagestatus = status;
}
public int getImageId() {
return this.imageId;
}
public void setImageId(int imageId) {
this.imageId = imageId;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getImageStatus(){
return this.imagestatus;
}
public void setImagestatus(int imgStatus)
{
this.imagestatus = imgStatus;
}
}
main activity:
package com.example.matant.gpsportclient.Controllers;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import com.example.matant.gpsportclient.AsyncResponse;
import com.example.matant.gpsportclient.R;
import com.example.matant.gpsportclient.Utilities.InviteUsersArrayAdapter;
import com.example.matant.gpsportclient.Utilities.InviteUsersListRow;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class InviteUsersActivity extends AppCompatActivity implements AsyncResponse, View.OnClickListener,AdapterView.OnItemClickListener {
private EditText editTextSearch;
private Button btnSave,btnDiscard;
private ListView usersListView;
private List<InviteUsersListRow> rowUser;
private DBcontroller dbController;
public static final String EXTRA_USERS = "";
ListView listViewUsers;
List<InviteUsersListRow> rowUsers;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_invite_users);
editTextSearch = (EditText) findViewById(R.id.editTextSearch);
btnSave = (Button) findViewById(R.id.ButtonSave);
btnDiscard = (Button)findViewById(R.id.ButtonDiscard);
editTextSearch.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
sendDataToDBController();
}
#Override
public void afterTextChanged(Editable s) {
}
});
btnDiscard.setOnClickListener(this);
}
#Override
public void handleResponse(String resStr) {
Log.d("invite_Response", resStr);
if (resStr != null) {
try {
JSONObject json = new JSONObject(resStr);
String flg = json.getString("flag");
Log.d("flag",flg);
switch (flg){
case "user found":{
JSONArray jsonarr = json.getJSONArray("users");
Log.d("array",jsonarr.toString());
rowUsers = new ArrayList<InviteUsersListRow>();
for(int i = 0; i < jsonarr.length();i++){
{
Log.d("user is", jsonarr.getJSONObject(i).toString());
String name = jsonarr.getJSONObject(i).getString("name");
String mobile = jsonarr.getJSONObject(i).getString("mobile");
InviteUsersListRow rowUser = new InviteUsersListRow(R.id.profileImage, R.id.imageButtonInviteUser, name, mobile);
rowUsers.add(rowUser);
}
listViewUsers = (ListView) findViewById(R.id.listViewusers);
InviteUsersArrayAdapter Useradapter = new InviteUsersArrayAdapter(this,R.layout.invite_users_listview_row,rowUsers);
listViewUsers.setAdapter(Useradapter);
listViewUsers.setOnItemClickListener(this);
}
break;
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}else
Log.d("ServiceHandler", "Couldn't get any data from the url");
}
#Override
public void sendDataToDBController() {
String username = editTextSearch.getText().toString();
BasicNameValuePair tagreq = new BasicNameValuePair("tag", "search_user");
BasicNameValuePair name = new BasicNameValuePair("name", username);
List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();
nameValuePairList.add(tagreq);
nameValuePairList.add(name);
dbController = new DBcontroller(this,this);
dbController.execute(nameValuePairList);
}
#Override
public void preProcess() {
}
#Override
public void onClick(View v) {
switch (v.getId())
{
case R.id.ButtonDiscard:
{
Intent i = new Intent();
setResult(RESULT_CANCELED,i);;
finish();
}
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
}

Replace the below
InviteUsersListRow rowUser = new InviteUsersListRow(R.id.profileImage, R.id.imageButtonInviteUser, name, mobile);
with
InviteUsersListRow rowUser = new InviteUsersListRow(R.drawable.camera, R.drawable.add_user_50, name, mobile);
The pic should be from "R.drawable" not from "R.id"
You should actually set an image resource below and not an id
holder.imageView.setImageResource(rowItem.getImageId());
holder.imgStatus.setImageResource(rowItem.getImageStatus());
In the above code you are not setting a drawable item.

Inflate ListView with TreeMap data (Custom Adapter)

Solved: I have created an adapter based on #JJV 's suggestion. I am aware that there is plenty of room for improvement, but it works for now.
I have updated this simplified version of my program, with the working code; I hope it will be useful to others:
MainActivity.java:
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListAdapter;
import android.widget.ListView;
import java.util.Map;
import java.util.TreeMap;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
Map<Integer, Object> m = new TreeMap<Integer, Object>();
int key = 123;
Item obj1 = new Item("abc", "xyz", 888);
m.put(key, obj1);
key = 456;
Item obj2 = new Item("def", "zyx", 999);
m.put(key, obj2);
ListAdapter adapter = new TreeMapAdapter(this, (TreeMap<Integer, Object>) m);
ListView itemListView = (ListView) findViewById(R.id.itemListView);
itemListView.setAdapter(adapter);
}
public class Item {
private String name;
private String thing;
private int number;
Item(String name, String thing, int number) {
this.name = name;
this.thing = thing;
this.number = number;
}
public String getName() {
return this.name;
}
public String getThing() {
return this.thing;
}
public int getNumber() {
return this.number;
}
}
}
main_activity.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/itemListView" />
</LinearLayout>
listview_row.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/name" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/thing" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/number" />
</LinearLayout>
TreeMapAdapter.java:
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.TreeMap;
public class TreeMapAdapter extends ArrayAdapter<String> {
private Context context;
private TreeMap<Integer, Object> treeMap;
private Integer[] mapKeys;
public TreeMapAdapter(Context context, TreeMap<Integer, Object> data) {
super(context, R.layout.listview_row);
this.context = context;
this.treeMap = data;
mapKeys = treeMap.keySet().toArray(new Integer[getCount()]);
}
public int getCount() {
return treeMap.size();
}
public String getItem(int position) {
return String.valueOf(treeMap.get(mapKeys[position]));
}
public long getItemId(int position) {
return mapKeys[position];
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater deviceInflater = LayoutInflater.from(getContext());
View listViewRow = deviceInflater.inflate(R.layout.listview_row, parent, false);
MainActivity.Item test = (MainActivity.Item) treeMap.get(mapKeys[position]);
String nameString = test.getName() + ", ";
String thingString = test.getThing() + ", ";
String numberInt = String.valueOf(test.getNumber());
TextView name = (TextView) listViewRow.findViewById(R.id.name);
TextView thing = (TextView) listViewRow.findViewById(R.id.thing);
TextView number = (TextView) listViewRow.findViewById(R.id.number);
name.setText(nameString);
thing.setText(thingString);
number.setText(numberInt);
return listViewRow;
}
}
Result:
I cannot embed a screenshot of the result in this post, because I do not have 10 reputation, but you can see the result of running the code here: http://i.stack.imgur.com/QoXX1.png

do something like this:
public class TreeMapAdapter extends ArrayAdapter<String> {
private Context context
private TreeMap<Integer, Object> treeMap;
private int mapKeys[];
public TreeMapAdapter(Context context,TreeMap<Integer, Object> treeMap)
this.context=context;
this.treeMao=treeMap;
mapKeys=treemap.keySet().toArray();
}
public int getCount() {
return treeMap.size();
}
public String getItem(int position) {
return treeMap.get(mapKeys[position]);
}
public long getItemId(int position) {
return mapKeys[position];
}
//your getView method....
}

ListFragment is not display Data [closed]

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I am working on a project where I have to display a list of available Professors for a department. Instead of displaying all professors, I want to allow a student to search professors by Department. As a result, the student will logs in, search for a professor based on name, department, course ID, or all. I am using a custom list adapter. I noticed that Adapter object is not null, but the list is still showing "No records available to display. I think the issue has to do with the way that I am setting the adapter in the ProfessorDetail class. What am I doing wrong here?
See codes below:
Professors Class
package com.mb.professor;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import com.mb.professor.asynctasks.ProfessorAsyncTask;
/**
* Created by Gagouche on 7/25/13.
*/
public class Professors extends FragmentActivity {
private Button bSearch;
private EditText etSearchBy;
private EditText etCourseId;
private Spinner spSearchDecision;
private String searchValue = null;
private Professor[] _professor = null;
public Professors()
{
}
public Professors(Professor[] professor)
{
this._professor = professor;
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.professor);
InitialVariables();
}
private void InitialVariables()
{
bSearch = (Button) this.findViewById(R.id.bSearch);
etSearchBy = (EditText) this.findViewById(R.id.etSearchByDepartment);
etCourseId = (EditText) this.findViewById(R.id.etSearchByCouseId);
spSearchDecision = (Spinner) this.findViewById(R.id.spOption);
bSearch.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(searchValue == "Department")
{
ProfessorAsyncTask professor = new ProfessorAsyncTask();
professor.execute("");
FragmentManager mFragment = getSupportFragmentManager();
FragmentTransaction ft = mFragment.beginTransaction();
ProfessorDetail pDetail = new ProfessorDetail();
pDetail.setProfessorAdapter(_professor);
ft.replace(R.id.fprofessorDetail, pDetail);
ft.addToBackStack(null);
ft.commit();
}
}
});
spSearchDecision.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
switch (position)
{
case 0:
searchValue = "By All";
break;
case 1:
searchValue = "Department";
break;
case 2:
searchValue = "CourseId";
break;
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
searchValue = "By All";
}
});
}
}
ProfessorDetail Class
package com.mb.professor;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import com.mb.professor.adapter.*;
/**
* Created by Gagouche on 7/25/13.
*/
public class ProfessorDetail extends ListFragment {
private ProfessorAdapter adapter = null;
Professor[] prof = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void setProfessorAdapter(Professor[] professor)
{
prof = professor;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String [] emptyAdapter = {};
if(prof == null)
{
ArrayAdapter<String> emptyListAdapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,emptyAdapter);
setListAdapter(emptyListAdapter);
} else
{
adapter = new ProfessorAdapter(getActivity(), R.layout.professor_row, prof);
adapter.notifyDataSetChanged();
setListAdapter(adapter);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.customizelayout, container, false);
}
}
Course Detail Class
package com.mb.professor;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import com.mb.professor.adapter.CourseAdapter;
import java.util.List;
/**
* Created by Gagouche on 7/25/13.
*/
public class CourseDetail extends ListFragment {
private CourseAdapter adapter = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void setCourseData(Course[] course)
{
adapter = new CourseAdapter(getActivity(), R.layout.course_row, course);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
String[] course = {};
if(adapter == null)
{
ArrayAdapter<String> emptyAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1 , course );
setListAdapter(adapter);
} else
{
setListAdapter(adapter);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.customizelayout, container, false);
}
}
Login Course
package com.mb.professor;
import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class Login extends Activity implements View.OnClickListener {
Button btnLogin;
EditText etUsername, etPassword;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
initializeVariables();
}
private void initializeVariables()
{
btnLogin = (Button) this.findViewById(R.id.btnLogin);
etUsername = (EditText) this.findViewById(R.id.etUserName);
etPassword = (EditText) this.findViewById(R.id.etPassword);
btnLogin.setOnClickListener(this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
#Override
public void onClick(View v) {
String uName = etUsername.getText().toString();
String pWord = etPassword.getText().toString();
if(uName.equals("college") && pWord.equals("florida"))
{
Intent intent = new Intent(this, Professors.class);
startActivity(intent);
}
}
}
Professor AsyncTask
package com.mb.professor.asynctasks;
import android.os.AsyncTask;
import android.support.v4.app.FragmentActivity;
import com.mb.professor.Course;
import com.mb.professor.Professor;
import com.mb.professor.ProfessorDetail;
import com.mb.professor.Professors;
import com.mb.professor.R;
/**
* Created by Gagouche on 8/1/13.
*/
public class ProfessorAsyncTask extends AsyncTask<String,Void,Professor[]> {
private FragmentActivity fActivity;
public ProfessorAsyncTask()
{
}
#Override
protected Professor[] doInBackground(String... params) {
Professor[] professor = new Professor[5];
professor[0] = new Professor("Finance", "John", "123", "Accounting");
professor[1] = new Professor("Accounting", "Cain", "124", "finance");
professor[2] = new Professor("Database", "Eugene", "125", "Music");
professor[3] = new Professor("Finance", "Seikei", "126", "Engineer");
professor[4] = new Professor("Finance", "Bojok", "127", "Math");
return professor;
}
#Override
protected void onPostExecute(Professor[] professors) {
super.onPostExecute(professors);
// ProfessorDetail professorDetailFragment = (ProfessorDetail)fActivity.getSupportFragmentManager().findFragmentById(R.id.fprofessorDetail);
// Professors prof = new Professors(professors);
}
}
Course AsyncTask
package com.mb.professor.asynctasks;
import android.app.FragmentTransaction;
import android.os.AsyncTask;
import android.support.v4.app.FragmentActivity;
import com.mb.professor.Course;
import com.mb.professor.CourseDetail;
import com.mb.professor.R;
import java.util.List;
/**
* Created by Gagouche on 8/1/13.
*/
public class CourseAsyncTask extends AsyncTask<String, Void, Course[]> {
private FragmentActivity mActivity;
private Course[] course = null;
public CourseAsyncTask(FragmentActivity activity)
{
this.mActivity = activity;
}
#Override
protected Course[] doInBackground(String... params) {
Course[] course = new Course[5];
course[0] = new Course("Finance", "John", "123");
course[1] = new Course("Accounting", "Cain", "124");
course[2] = new Course("Database", "Eugene", "125");
course[3] = new Course("Finance", "Seikei", "126");
course[4] = new Course("Finance", "Bojok", "127");
return course;
}
#Override
protected void onPostExecute(Course[] courses) {
super.onPostExecute(courses);
CourseDetail courseDetailFragment = (CourseDetail) mActivity.getSupportFragmentManager().findFragmentById(R.id.fCourseDetail);
courseDetailFragment.setCourseData(courses);
}
}
Professor Adapter
package com.mb.professor.adapter;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.mb.professor.*;
import java.util.List;
/**
* Created by Gagouche on 8/1/13.
*/
public class ProfessorAdapter extends ArrayAdapter<Professor> {
private Context context;
private int layoutResourceId;
private Professor[] data = null;
public ProfessorAdapter(Context context, int layoutResourceId, Professor[] data) {
super(context, layoutResourceId, data);
this.context = context;
this.layoutResourceId = layoutResourceId;
this.data = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ProfessorHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId,parent, false);
holder = new ProfessorHolder();
holder.tvFirstName = (TextView) row.findViewById(R.id.tvFirstName);
holder.tvLastName = (TextView) row.findViewById(R.id.tvLastName);
holder.tvCourse = (TextView) row.findViewById(R.id.tvCourseID);
holder.tvDepartment = (TextView) row.findViewById(R.id.tvDepartment);
row.setTag(holder);
} else
{
holder = (ProfessorHolder) row.getTag();
}
Professor item = data[position];
holder.tvFirstName.setText(item.getFirstName());
holder.tvLastName.setText(item.getLastName());
holder.tvDepartment.setText(item.getDepartmentID());
holder.tvCourse.setText(item.getCourseId());
return row;
}
static class ProfessorHolder
{
TextView tvFirstName;
TextView tvLastName;
TextView tvDepartment;
TextView tvCourse;
}
}
Course Adapter
package com.mb.professor.adapter;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.mb.professor.Course;
import com.mb.professor.R;
/**
* Created by Gagouche on 8/1/13.
*/
public class CourseAdapter extends ArrayAdapter<Course> {
private Context context;
private int layoutResourceId;
private Course[] data = null;
public CourseAdapter(Context context, int resource, Course[] data) {
super(context, resource, data);
this.context = context;
this.layoutResourceId = resource;
this.data = data;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
CourseHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new CourseHolder();
holder.tvCourseInstructor = (TextView) row.findViewById(R.id.tvCourseInstructor);
holder.tvCourseId = (TextView) row.findViewById(R.id.tvCourse);
holder.tvCourseName = (TextView) row.findViewById(R.id.tvCourseName);
row.setTag(holder);
} else {
holder = (CourseHolder) row.getTag();
}
Course item = data[position];
holder.tvCourseId.setText(item.getCourseId());
holder.tvCourseName.setText(item.getCourseName());
holder.tvCourseInstructor.setText(item.getInstructorName());
return row;
}
static class CourseHolder
{
TextView tvCourseName;
TextView tvCourseInstructor;
TextView tvCourseId;
}
}
Login XML
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="User Name"
android:id="#+id/textView"
android:layout_alignParentTop="true"
android:layout_marginTop="30dp"
android:layout_gravity="center_horizontal"
android:layout_centerHorizontal="true"
android:textSize="30sp"
/>
<EditText
android:layout_width="200sp"
android:layout_height="wrap_content"
android:id="#+id/etUserName"
android:layout_below="#+id/textView"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Password"
android:id="#+id/textView2"
android:layout_below="#+id/editText"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
android:textSize="30sp"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:ems="10"
android:id="#+id/etPassword"
android:layout_below="#+id/textView2"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
android:layout_marginTop="10dp"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Login"
android:id="#+id/btnLogin"
android:layout_gravity="center_horizontal"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>
</LinearLayout>
Professor XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_weight="1"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search For Professor"
android:id="#+id/textView"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:textSize="30sp"
/>
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:hint="search by Department"
android:id="#+id/etSearchByDepartment"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search by Course ID"
android:id="#+id/textView2"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:textSize="30sp"
/>
<EditText
android:layout_width="250dp"
android:layout_height="wrap_content"
android:id="#+id/etSearchByCouseId"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
/>
<Spinner
android:layout_width="321dp"
android:layout_height="wrap_content"
android:id="#+id/spOption"
android:entries="#array/searchOption"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
/>
<Button
android:id="#+id/bSearch"
android:text="Search"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginLeft="5dp"
/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="2"
android:orientation="vertical"
>
<fragment
android:layout_width="match_parent"
android:layout_height="0dp"
android:name="com.mb.professor.ProfessorDetail"
android:id="#+id/fprofessorDetail"
android:layout_weight="1"
android:layout_gravity="center"/>
<fragment
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:name="com.mb.professor.CourseDetail"
android:id="#+id/fCourseDetail"
android:layout_gravity="center"/>
</LinearLayout>
</LinearLayout>
Professor Row Custom XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First Name"
android:layout_marginLeft="10dp"
android:id="#id/tvFirstName"
android:layout_gravity="center_horizontal|top"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Last Name"
android:layout_marginLeft="10dp"
android:id="#id/tvFirstName"
android:layout_gravity="center_horizontal|top"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:layout_marginLeft="10dp"
android:id="#id/tvDepartment"
android:layout_gravity="center_horizontal|top"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="New Text"
android:id="#id/tvCourseID"
android:layout_gravity="center_horizontal|top"/>
</LinearLayout>
Customize Layout for the ListViews
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#id/android:list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|center_vertical"/>
<TextView
android:id="#id/android:empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="No Record to be displayed."
android:textSize="25sp"
android:layout_gravity="left|center_vertical"/>
</LinearLayout>
Here is the exception:
08-05 13:26:25.619 716-731/com.android.exchange D/ExchangeService: Received deviceId from Email app: null
08-05 13:26:25.619 716-731/com.android.exchange D/ExchangeService: !!! deviceId unknown; stopping self and retrying
08-05 13:26:27.242 1055-1055/com.mb.professor D/AndroidRuntime: Shutting down VM
08-05 13:26:27.242 1055-1055/com.mb.professor W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-05 13:26:27.302 1055-1055/com.mb.professor E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException: storage == null
at java.util.Arrays$ArrayList.(Arrays.java:38)
at java.util.Arrays.asList(Arrays.java:154)
at android.widget.ArrayAdapter.(ArrayAdapter.java:128)
at com.mb.professor.adapter.ProfessorAdapter.(ProfessorAdapter.java:23)
at com.mb.professor.ProfessorDetail.setProfessorAdapter(ProfessorDetail.java:23)
at com.mb.professor.Professors$1.onClick(Professors.java:57)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)

Am I mistaking ? but you call notifyDataSetChange before the asynctask is finished. You have to call notifyDataSetChange in the onPostExecute of your async task. And therefore your list is empty.
In your code you do in the Professor detail class
adapter = new ProfessorAdapter(getActivity(), R.layout.professor_row, prof);
adapter.notifyDataSetChanged();
setListAdapter(adapter);
you notify the data change and link the adapter to the list. But you never do it again. Your onPost Execute is empty.
What you have to do is move the adapter.notifyDataSetChanged(); to the onPostExecute and your list will be refreshed.
EDIT
Let me show you an example of my code.
public class MyAsyncTaskFragment extends Fragment {
private ListView lv;
private CustomAdapter adapter;
private ArrayList<...your custom type here...> listItems = new ArrayList<...your custom type here...>();
...
#Override
public void onActivityCreated (Bundle savedInstanceState){
//get the listView
lv = (ListView) getView().findViewById(R.id.my_listview_name);
//create new adapter
adapter = new CustomAdapter();
//link adapter to listview
lv.setAdapter(adapter);
//in my case I want the async task to start over when the activity is created
new DoAsyncTask().execute();
}
private class DoAsyncTask extends AsyncTask<Void, Integer, Integer>{
protected void onPreExecute() {
listItems.clear();
}
protected Integer doInBackground(Void...voids) {
//add items to the list
listItems.add(...your custom type here ...);
return null;
}
protected void onPostExecute(Integer result) {
if (listItems.size() > 0){
adapter.notifyDataSetChanged();
}
}
}
}